不良导体导热系数测量与智能仪器的研制  

The measurement of thermal conductivity and the design of intelligent instrument

作　　者：周雯[1] 张广斌[2] 牛兰[1] 

机构地区：[1]南京航空航天大学自动化学院,江苏南京210000 [2]南京航空航天大学理学院,江苏南京210000

出　　处：《电子设计工程》2014年第17期179-181,共3页Electronic Design Engineering

基　　金：南京航天大学大学生创新基金资助项目(201310287014Y)

摘　　要：针对不良导体导热系数难以准确测量的问题,采用32位的STM32嵌入式系统,设计开发了智能型导热系数测量仪。其中采用PID算法输出PWM实现对加热器的恒温控制,设计高精度的恒流源对传感器供电实现温度的0.1°精确测量,并通过自动的散热曲线的二阶拟合,减少了人为测量的误差。实验表明该仪器的实际误差可降低到3%。其较传统测量仪器具有自动化程度高,测量精度高,操作简单,界面可视化等优点。To detect thermal conductivity of poor conductor, an intelligent thermal conductivity meter is designed with STM32 embedded system. Within the meter, temperature of the heater is controlled by the PWM output of PID algorithm. Moreover, with power supply from the high-precision constant current source, the accuracy of temperature measurement reaches 0.1~. Besides, Processing data automatically with second-order polynomial declines the relative error to less than 3%. Compared with traditional instruments, it has a higher degree of automation, higher accuracy, simpler manipulation, better GUI, etc.

关 键 词：导热系数 测量仪器 稳态法 曲线拟合 

分 类 号：TN99[电子电信—信号与信息处理]